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首页> 外文会议>International Symposium on Heat Transfer Enhancement and Energy Conservation(ISHTEEC) vol.2; 20040112-15; Guangzhou(CN) >FLOW AND HEAT TRANSFER CHARACTERISTICS OF SUPERCRITICAL CARBON DIOXIDE IN MULTI-PORT EXTRUDED MINI CHANNELS
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FLOW AND HEAT TRANSFER CHARACTERISTICS OF SUPERCRITICAL CARBON DIOXIDE IN MULTI-PORT EXTRUDED MINI CHANNELS

机译：多端口挤压微型通道中超临界二氧化碳的流动和传热特性

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摘要

This paper reports on the heat transfer and the pressure drop characteristics of supercritical CO_2 in a multi-port extruded aluminum test section, which had 10 circular channels each with 1.31 mm inner diameter. CO_2 was cooled with cooling water flowing inside copper blocks that were attached at the outer sides of the test section. Local heat fluxes and temperatures at the outer surface of the test section were measured using twelve heat flux sensors and 24 K-type thermocouples. Bulk mean temperatures of CO_2 at the inlet and outlet of the test section were also measured. The operating pressures ranged from 7.4 to 8.5MPa, the inlet fluid temperatures changed from 22 to 53℃, and the mass velocities varied from 113.7 to 418.6kg/m~2s. Both the local and average heat transfer coefficients and pressure drop were determined. The results indicate that high heat transfer coefficients are achieved in the near-critical region, and that the system pressure, the mass velocity and the temperature of CO_2 all have important effects on the heat transfer characteristics. The measured average heat transfer coefficients were compared with correlations reported in the literature. Based on the experimental data collected in the present work, a new correlation was developed for forced convection of supercritical CO_2 in horizontal mini channels in cooling case.
机译：本文报告了多端口挤压铝质试验段中超临界CO_2的传热和压降特性，该试验段具有10个圆形通道，每个通道的内径为1.31 mm。用冷却水在铜块内部流动的冷却水冷却CO_2，铜块固定在测试部分的外侧。使用十二个热通量传感器和24 K型热电偶测量了测试部分外表面的局部热通量和温度。还测量了测试部分进口和出口处的CO_2体积平均温度。工作压力范围为7.4至8.5MPa，入口流体温度为22至53℃，质量速度为113.7至418.6kg / m〜2s。确定了局部和平均传热系数以及压降。结果表明，在近临界区域实现了较高的传热系数，并且系统压力，质量速度和CO_2的温度均对传热特性产生重要影响。将测得的平均传热系数与文献中报道的相关性进行了比较。基于目前工作中收集到的实验数据，为冷却工况下水平微型通道中超临界CO_2的强迫对流建立了新的相关性。

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